Aviation camera-shutter-operating mechanism



Jan. 8, 1929. 1,698,063

G. H. OHLAU AVIATION CAMERA SHUTTER OPERATING MECHANISM Original FiledJan. 8, 1924 5 Sheets-Sheet 1 w ml 1 J i k3 George x A TTORNEYS.

Jan. 8, 1929. 1,698,063

G. H. OHLAU AVIATION CAMERA SHUTTER OPERATING MECHANISM Original FiledJan. 8, 1924 5 Sheets-Sheet 2 g mme Q George H. OhZau,

,INVENTOR, $963 BY 6$)! A TTORNEYS.

Ja n. 8, 1929. 1,698,063

e. H. OHLAU AVIATION CAMERA SHUTTER OFERATING MECHANISM Original FiledJan. 8, 1924 5 Sheets-Sheet 5 \l I; u v

52 p Z6 lmlll'llmm y George H. 0171 INVEN TOR, w BY M A TTORNEYS.

Jan. 8, 1929.

wFh'Jlillllllllll-lr 1,698,063 (3. H. OHLAU AVIATION CAMERA SHUTTEROPERATING MECHANISM Original Filed Jan. 8, 1924 s Sheets-Sheet 4 GeozyeH OhZaw,

IN V EN TOR, I

ATTORNEYS.

Jan. 8, 1929. 1,698,063

G. H. OHLAU AVIATION CAMERA SHUTTER OPERATING MECHANISM Original FiledJan. 8, 1924 5 Sheets-Sheet 5 George 102 AW 1 I BY W 41 V 140 5 E UATTORNEYS.

1 tween the handle and otl er Patented Jan. 8, 1929.

' urrah stares FATENT OFFICE.

GEORGE H. OHLAU, OF ROCHESTEE, NEW YGRK, ASSIGNGR TO EASTMAN KODAK COM-PA'NY, OF ROCHESTER, NEW/V YORK, A CORPORATION OF NEW YORK.

AVIATION CAMEBA-SHU'ITER-OPERATING MECHANISM.

Original application filed January 8, 1924, Serial No. 885,054. Dividedand this application filed July 8,

This invention relates to photographv and v 7 more particularly tophotographic caixeras designed particularly for aviation photography.One object of my invention is to provide such a camera in whic series ofexposures may be made rapidly; another objectis to provide a. cau'ierahaving gripping handles for holding the camera and control.- ling theexposures, so that the camera may be operated without releasing thehandles; an other object is to provide means for setting and trippingthe camera shutter through the iandles; another objectis toprovidesuitablc connections between the handle and shutter for actuatingthe latter, and connections bemechanism so the various parts may beoperated through the handle in proper timed relation; and still anotherobject is to provide a camera with two handles, one movable relative tothe othe to facilitate actuating the movable parts; and other objectswill appear hereinafter from the specification, the novel features beingparticularly pointed out in the claims at the end thereof.

This application is a division from my original application for aviationcameras, filed Jan. 8, 1924., Serialllo. 6853M, this application issuinginto Patent No. 1,6-l5,923, Gctoher 18, 192?. r

In the drawings wherein like reference characters designate like partsthroughout:

' 1 i a side elevation of a camera conin accordance with and embodyingone term of my invention;

'. 2 is front elevation of the camera p on plan view of the roll. holderplan view of the bellows Serial No. 204,364.

Fig. 10 is a fragmentary elevation of the handle controlling latch; I K

Fig. 11 is an enlarged section through a portion of the camera showingthe main driving cam with its associated mechanism;

Fig. 12 is a front elevation of the shutter showing the shutter settingand tripping ring;

13 is a fragmentary plan, partially in section, showing the rack latch;

Fig. .14 is an elevation of the main driving cam showing also a portionof its associated mechanism Figs. 15 and 16 show, in section, difierentpositions of the shutter controlling hub;

Fig. 17 shows the tripping bar and its relation to the hub latch;

Fig. 18 is a side elevation of a portion of the film-driving gears;

Fig. 19 is a fragmentary section showing the. take-up film spool inoperative position; and Fig. is a section on line 2020 of Fig. l l.

This camera may be held by the handles on each side of the body and anexposure may be made by pressing the release which is close to onehandle. The film can then be wound and the shutter set" by turning thehandlefrom the position shown in full lines in Fig. l to the positionshown in dashed lines. This operation also places the bellows operatinglever under tension so that it may be tripped to flatten the film justbefore the shutter is tripped.

The camera consists of a main casing 1 having an enlarged end 2 in whichthe roll holder is mounted and having a frontS which supports a lensboard 4. The protecting sleeve 5 is carried by the lens board andsupports, inside of the sleeve, a lens 6 mounted in a shutter 7.

The shutter is of the betweentl1e-lens type which requires settingbefore an exposure is made. A number of shutters of this type are now onthe market.

Handles 8 and 9 are supported on the sides of the camera, handle 9 beingmounted upon a shaft 10 passing into the bearing 11 mounted on the sideof the camera. A finder 12, preferably of the folding direct view type,may be mounted upon a block 13 on the top wall of the camera casing 1.There is an operforms a part of shai volved'through gear 30. The webmaybe ating lever 14c mounted above handle 9 in a position in which itcan be operated by one finger of ahand which is supporting the camerathrough iandle 9.

The camera back consists of a removable plate 15 having a light tightconnection with the camera. body 1 through the flanges 16. This backcarries two pairs of flanges 17 from which pins 18 extend inwardly intoa position in which they will engage the bayonet latch 19 of the plates20 which can he slid by the finger grip 21 upon the pins 22 which passtl'irough slots 23 in these plates. Eachplate may be held in a lockingposition by means of a leaf spring 2% engaging an opening 25 in theplate/ The roll holder, film-winding mechanism and film-flatteningmechanism are all mounted upon plate 15. A supply reel of film iscarried by brackets 26 which support spool centering pins 27. A take-upspool S (Fig. 19) is carried by asecond pair of brackets 26 similar tothe first pair, the spool being carried by the webs 28 and 33 whichengage in slots in each end of the spool. Web 28 t 29 which may berewithdrawn from the spool by means of the knob 31 which is normallyheld toward the spool by spring 32. el; 33 is attached to shaft 3% whichterminates in a slotted head 35, this member being pressed by spring 26'toward the spool S. Shaft 36 has a web 37 which engages the slotted headwhen the knob 38 in the position shown in full lines in Fig. 19. Aspring 39 normally holds it in this position.

Film is led from the supply spool over roller 40 (Fig. 3) across plate41 over roller 42 after which it is wound up upon spool S. Plate 41 hasa series of perforations 4:23. There is an air chamber beneath thisplate formed by a second plate d4; spaced from plate 41 by means of aseries of'formed-up knobs 45, There is an opening 46 in plate 44 leadingto a bellows 4:? which carries a bottom plate 48. This plate *arries apair of bearings as into which pins 50 of the levers 51 pass. Levers5,1; as best shown in Fig. 9. turn about a shaft 52 carried by supports53 being normally turned by astrong spring 54 in the direction indicatedby the arrow, Fig. 4:. This spring engages a pin 55 in the middle of thespring and the side arms 51 at the ends of the s1 ring 56. Theends ofthe lever arms 51 come together at 57 and support an extended hook 58and a latch pin 59. The side arms just described form a be lowsoperat-ing lever. When this lever moves from the position shown in fulllines, Fig. 4, to that shown in dashed lines air will be drawn throughapertures 43 of plate il. thus momentarily sucking the film flat againstthe plain surface or plate 41.

Tlielat'eh pin 59 of the bellows operating lever may be held against thepressure exerted by spring 5% by means of the latch 61 which is carriedby a hinged member 61. This member is hinged to one of the brackets26'by means of a pintle 62 about the central part of which there is acoiled spring 63 which will turn segment 61 into engagement with a pin64: carried by plate 15. There is a pin 65 mounted upon segment 61 a dhaving a slightly beveled face 66. This portion is engaged by the end 67of a lever 68 pivoted at 69 to camera wall, as is shown in Fig. 11. Whenlever 68 is moved to elevate endfiT, this end will strike pin 66 movingsegment 61 inthe direction shown by the arrow, Fig. 5. thus releasingpin 59 fro n latch 61 and causing the bellows to function.

The roll holderfilm-winding mechanism (Fig. 6) consists of a rack 70meshing with a small gear 71 which drives a large gear 72 in onedirection only through the one-way clutch shown in Fig. 18. Thiscomprises the well known clutch formed by rollers 73 operating in camslots Tet so as to rotate shaft 75 when the rack is moved downwardly andso as to release shaft 75 when the rack moves in the opposite direction.This rack is normally held in the raised positioin shown in Fig. 6, bymeans of a lever 76 pivoted at 76 to a bracket 26 and bein normallythrust upward by a spring 77. A pin 78 on the rack passes through slot79 in plate 80 and engages the end 81 of lever 75. The upper end 82 ofrack 70 is slotted at 83 and carries a pin 84: which engages a portionof the rack V spool S the diameter of the convolutions of lm graduallyincrease so that it is necessary to turn tl e spool S through a smallerangle for each successive exposure area of film positioned on plate 41.To care for the varying diameter of the take-up spool the followingmechanism, best shown in Figs? and S. is used: Lever 89 pivoted at 90 toa support 91 carries a roller 92 which contacts with the outermostconvolutions of film wound upon the spool S. Lever 89 has a branch 93slotted at 94 to receive a pin 95 extending from lever 96, this leverbeing slidablv mounted in a bearing 97. A second pin 98 extends frommember 96 into slot 83 of the rack 70. As the coni 'olutions of filmmove the roller 92 toward plate 15 pin 98 is moved also towards plate 15thus forming a stop which prevents the r ck 70 from moving to its upperlimit of movement. This automatically shortens the throw of rack 0 andconsequently causes it 'to move gears 71, 72 and 30 a shorter distanceat each successive operation so that the proper amount film will bewound into position for exposure ateach actuation of rack 70.

All of the above described mechanism forms a part of the roll holderwhich is mounted upon plate 15. This can be removed in a unit from thecamera body 1. I will now describe the mechanism carried by the camerabody which furnishes the power to operate the various movable parts ofthe roll holder.

A single movement of handle 9 from the position shown in full lines tothat shown in dashed lines, Fig. 1, winds up the film, sets the bellowsoperating lever and sets the shutter all in position for an exposure.This is referred to as the operative position for the variousmechanisms.

The handle 9 is attached to shaft 10 and turns this shaft in its bearing11. Referring to Fig. 11, a plate is aflixed to shaft 10 so as to movewith it. This plate has a curved edge 101 which forms one side of a camslot the other side being formed by a flange 102 formed over on the edgeof plate 103 which is fastened to plate 100. A roller 104 is pivoted at105 to a sliding bar 106 which is adapted to move'between plates 107upon rails 108. This roller is moved by the cam above described from theposition shown in full lines to that shown in dashed lines when thehandle 9 is moved through approximately 90. The end 109 of bar 106 isadapted to contact with the knob110 on the end of the bellows operatinglever. Vhen, therefore, the rack is reciprocated it will move thebellows operating lever against the tension of spring 5 1 to the setposition shown in Fig 4:.

One cycle of operations of bar 109, that is, one back and forthmovement, is adapted to reciprocate the film-winding rack 70 through thefollowing mechanism An arm 111 is attached to slide 109 extendingupwardly from the slide and across to a guidcway 112 (see Fig, Theenlarged end 113 of the arm 111 carries a plate 1141 to which a springarm 115 is attached by rivets 116. This spring arm extends beneath part113 and has an aperture 117 adaptedto engage the pin 84 of rack 70. Oneside 118 of this spring extends beneath one side of the guideway 112 ina position to engage-a cam 120. lVhen part 106 is moved from theposition shown in full lines in Fig. 11 the lug 118 permits the springmember 115 to ride upon the cam 120 into a position in which it willengage pin 84. In this way pin 8-1 is engaged only during the end of thereciprocation of the slide 106.

The reason for this short engagement with pin 84. is that when the rack70 has been moved to its innermost position to wind up the film by meansof the abutment 121 striklines.

ing the pin 84 it must then be returned to its outer limit of movementwhich is determined by the stop pin 98. This is normally accomplished bya spring 77 which presses upon arm 75 causing it to contact with pin 78.However, it is better to positively start the rack moving outwardly soas to assist spring 77 in starting the movement of the rack. As

the aperture 117 engages pin 81 at one extremity of its movement itpositively starts the rack bar on its return movement when the roller104 is drawn toward shaft 10 by means of handle 9. It should be notedthat this movement will not interfere with pin 98 stopping the rack bar70 at the desired position because the spring arm 115 iscammed down outof engagement with pin 84: by means of cam 120 before the rack can cometo astop against pin 98.

In order to hold the operating handle 9 (see Fig. 10) in eitherextremity of its movement there is a latch bar 125 which is normallypressed downwardly into a slot 127 by means of a spring 126. At each endof this slot there is an aperture 128 (only one being shown) into whichthe bar 125 may drop to hold the handle stationary. This bar can bemoved from locking engagement with an aperture 128 by means of lever 129fulcrumed at 130 to the handle support 131 and having an operatingbutton 132 positioned above the end of the handle. This position makesit possible for an operator to readil press the button 132'with histhumb whi e retaining a firm grip on the handle 9.

As before described the shutter 7 is of the well known setting type inwhich the setting lever 131v must be moved from the position shown infull lines, Fig. 12, to the position shown in dashed lines at 13 1 Thistensions the main shutter driving spring. In order to release theshutter, lever135 must be moved from position 135 (position shown indashed lines) to the position shown in full lVith this shutter a secondexposure can not be made unless the shutter is again set. In order toset the shutter and in order to trip the shutter to make the exposurethere is a ring 136 mounted so as to be movable about the rear lensbarrel 137, this barrel being an extension from the rear of the shuttersimilar to the lens barrel 138 which extends outwardly from the front ofthe shutfer. Ring 136 carries a gear segment 139 which meshes with agear segment 140 which is keyed to shaft 141. This shaft is turnedthrough approximately 40 periodically when the handle 9 is turned by amechanism which will be hereinafter described. Ring 136 carries asetting lug 1 12 which is moved from the position shown in full lines tothe position shown in dashed lines at 1 12 In order to trip the shutter,ring 136 also carries a tripping lug 1 13 which moves between thestations indicated by the dashed lines at 143 to the position shown infull lines in Which position the shutter has just been tripped. Vhenthegear segment 40 is moved in the direction or" the arrow the shutter isset and when it is moved in a reverse direct-ion the shutter is tripped.

he shutter setting mechanism is operated by means of handle 9 in thefollowing manner Referring to Fig. let the shaft 10 is affixed to turnwith handle 9. ed toturn freely upon shaft 10 and is provided withcut-out portions 1416 and 1 17. A pin 148 carried by plate 100 which isfixedly attached to shaft 10 moves through cut-out por tion 116 beingadapted to strike the lug 1 19 near the end of its cycle of movement.Pin 148 moves drum 115 through approximately an angle or" 410 theextremities of movement of drum 155 being shown in Figs. 1% and 15. F orthe rest of the movement of handle 9 the pin moves treely'in the cut-out1 16 its normal position of rest being shown in full lines at 148. Aspring 150 is attached to the drum at 151 and to plate 100 at 152. Thisspring tends to move lug 149 towards pin 1 18. Referring to Figs. lland20 drum 145 carries a gear 153 on its outer end, this gear meshing witha second beveled gear a. Gear .15 1 is mined to shaft 141 so as tooperate the shutter setting and tripping ring above described throughgear segments 1-10 and 139.

There is a drum latch 155 hinged to the camera at 156 and having aspring 157 which moves the latching member 158 towards the shaft 10. Atripping member 159 is also attached to lever 155 and is provided with acam face 160 (see Fig. 17 which is in the path or a trip bar 161. Thisbar moves through a slideway 162 being held by a light spring 163 in theposition shown in full lines, a screw 16% limiting its movement in onedirection. .Vhen, however, the end of the trip bar 165 is engaged byhook 58 which forms a part of the bellows operating lever 51 it is movelfrom the position shown in full lines to that shown in dashed lines,Fig. 17. This movement causes the curved end to engage cam 160 thusmoving lever 155 against the pressure of I member 158 from the drum.

8 Assuming the camera has been set and is in position for exposure tleerum 14-5 will be in the position shown in Fig. 16 wherein latch 158lies-inside or notch 1 17 eng ging the lug 168. In this positionthehaule 9 is latched in the position shown in full lines in 1. When lever1st is depressed ugh a mecha nism, which will be herei -ait-erdescribed, hook 58 strikes the end of tripping bar 162,- thus loweringthe drum latch 158 and permitting the drum 11 5 under the impulse ofspring 150 to move to the position shown in'Fig. 14. Spring 150,therefore, furnishes the power for moving shaft 1&1 and the shutteroperating ring 136 to the'position shown A drum 145 is mount-- spring157 and lowering the latch in full line in Fig. 12. Asthe shutterexposure lever 185 cannot be moved beyond this position it provides astop which limits the l'novement of drum inder the influence. of spring150. The exposure has now been made. Handle 9 is turned and towards thelatter part of its movement pin 1 18 will strike stop 1 19 and move thedrum from the position shown in 11 to the position shown in 15. Thelatch having already returned to its initial position releases lever 155and pern'iits latch 158 to a gain rest against the drum When the partsare in the posi tion shown in Fig. 15 the ring 136, Fig. 12, in posi ionto set the shu ter and the setting l 1 .nd the tripping lug 143 are inthe osition shown in the dashed lines in that fig: 'e. l ihen the handlereturns it will be noted rat the latched lug 158 engages stop 168, thusventing drum 145 from returning to the nation shown in Fig. 14'. In thisposition ie tripping lug (F 12) will be in the dot nd dash line position113 in which it con- -acts with the tripping lever 135. VVh-en latch 158releases stop 168 the drum moves from the position shown in Fig/16' tothat shown in Fig. 14-, moving the tripping lug from the position at 113to the position shown in full lines at 113, thus actuating the shutter.The tripping mechanism will now be described' The tripping lever 14,which, as shown in F 1, lies close to handle 9 so that it may be graspedby the first finger of an operators hand while he still retains a firmgrip on handle 9, is carried by a shaft 170. This shaft passes throughthe camera body 1 and carries a lever171 to which there is pivoted at172 a link 17 3. -'This link is pivoted at 17% to the end 175 of lever68 which is pivoted. at 69 to the camera body. This lever carries acut-out 76 so that it will not strike the cross bar 177 of lever 155, eeFig. '11). The end 67 of lever 68 engages the hinged segment 61 (Fig.5)to trip the bellows operat; ing lever 51 this lever moves upwardly andcompletes its function by drawing the film flat against plat 11. Thehook 58 by striking the tripping bar 162 releases the shutter to make anexposure at the moment that the film has been drawn flat in the focalplane.

It should be noted that the camera back plate 15 entry" g the rollholder, the bellows the film-winding rack and echanism and gears can-beremoved from the body portion of the camera by operating the two latchmemhe 's on each side of portion 2 of the camera All of the members onthe roll holder winch are actuated by members mounted in the camera bodymerely rest against each 7 other and are not latched together. When theopera tin o handle 9 is in the position shown in 1"; 2, the roll holdercan be removed without disengaging these cooperating parts. This greatlyfacilitates loading and unloading' the camer I The complete operation ofmy. camera is as follows: Starting with the parts in the position shownin Figs. land 2, in which the shutter has been set and the bellowsoperating lever spring has been set, the operator may press upon release14. This causes lever 68 to move about its pivot 69 through the forceexerted by lever 171 and link 173. The end 67 of this lever then strikesthe "face 65 of pin 66 moving the hingedsegment 61 so as to cause latch61 to slip oil pin 59. The bellows actuating lever 51 under the impulseof'spring 54 will then draw the bellows down to the position shown indashed lines, Fig. 4, drawing the lihn fiat against plate 41 through theair suction created through the apertures 43 by the bellows 47. As thelever 51 moves the bellows the hook 58 on the end of this lever engagesthe tripping bar 162 moving it against its s1 ring 163 into engage-'ment with cam 160 lowering lever 155 and withit the latch 158 fromdrum145. This movement permits the drum to turn under the impulse ofspring 150 thus moving the shutter actuating lever 143 from the positionshown in full lines in Fig. 2 to the position shown in lull lines inFig. 12. Thus an exposure is made during the moment the film is heldflat by means of the suction. The 3{) parts are now in what I call theirinoperative position.

In order to wind up a fresh area of film and in order to set the shutterand the bellows operating lever-spring the camera operatordepressesbutton 132 raising latch bar 125 from a notch 128 and permitting thehandle 9 to be moved from the full line to the dotted .line position asincicated in Fig. 1.

' This movement turns plate 100 and with it 40 the cam slot formed bythe plate edge 101 and the flange 102, thus causing roller 104 to moveslide 106 from the position shown in full lines, Fig. 11, to that shownin dashed lines. During this movement the end 109 of the slide 106 willstrike p rtion 110 of the bellows actuating lever 15 moving downwardlyagainst the pressure of spring 54 until pin 59 of this lever is engagedby the spring latch 61. The bellows is now in the raised or set positionshown in Fig.4. 7

This outward movement of the slide 106 also causes part 121'to strikepin 84 of the film-winding rack bar 7 0. As this rack bar is moveddownwardly against the pressure ena erted upon pin 78 by means or" leverand spring 77 the pin 84 becomes latched into aperture 117 carriedby'spring 115. The

downward movement rotates gears 71, 70 and 30 winding up the film. Asthe film grac- 7 o ually winds upon spool S roller 92 is depressedlowering bar and with it pin 98 which projects into the path of the rackbar 70. As the handle 9 is being returned to its initial position rackbar 7 0 through pin 84 a5 and the spring latch 115 will be started onits return movement. After a. short travel spring 115 will release pin84 as lug 118 strikes cam 120. This will permit the rack bar 7 0 to bemoved entirely through the action of spring 77 and lever 75. The rackbar will move upwardly until it strikes the stop pin 98. Since this pinlimits the movement oi the rack and since it is controlled by thediameter of the film convolutions on spool S it automatically controlsthe distance through which the film-winding gears are moved. Thisautomatically takes care of the varying diameter of the take-up spool sothat the correct amount of film will be wound into the exposureposition. The bellows has now been wound up and a fresh film area is inposition for exposure.

The movement of handle 9 back and i'lorth causes pin 148 to move drum145 and with it beveled gears 153 and 154 so as to turn shaft 141 andwith it-gear segments 140 and 139, thus causing the ring 136 through thesetting lug to strike and turn lever 134 of the shutter 7 so as to setthe shutter. Tho cant era is now in readiness for a second exposure.

Although a description of the moving parts is necessarily long themovements necessary to make a series oi exposures are actually veryshort and can be made by an operator without releasing his grasp uponthe two handles 8 and 9 by which the camera is supported. While I haveillustrated, in the drawings, a preferred embodiment of my invention Ido not wish to be limited to the structure shown in this embodiment andcontemplate as within the scope of my invention all such modificationsas may come within the scope of the appended claims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is,

1. In an aviation camera, the combination with a camera body, ot ashutter mounted at one end of the body and having a sett'ng and atripping lever, a ring mounted to turn about the shutter, a lug mountedon the ring and aoapted to engage the setting lever when the ring ismoved in one direction, and means for moving the ring.

2. In an aviation camera, the combination with a camera body, of ashutter mounted at one end-of the body and having a setting and atripping lever, a ring mounted to turn about the. shutter, lug mountedon the ring and adapted to engage the'tripping lever when the ring ismoved in one direction, and means for moving the ring.

3. In an aviation camera, the combination with a camera body, of ashutter mounted at one end of the body and having a setting and atripping lever, a ring mounted to turn about the shutter in twodirections, a lug mounted on the ring and adapted to engage the settinglever, a second lug mounted on the ring and ably mounted with respect tothe other and mechanism cooperating with the movably mounted handle andwith tie shutter lever for moving the latter to set the shutter when thehandle is moved in one direction.

i i. In an aviation camera, the combination with a camera body, of ashutter mounted on said body, a setting member on said shutter, meansfor supporting the camera including a pair of spaced handles one movablymounted with respect to the other and mechanism adapted to be moved bythe movable handle and a lost motion connection betweenaid mechanism andthe shutter setting lever, whereby the latter may be moved by themechanism through the handle when the handle moves one direction;

15. In an aviation camera, the combination with a camera body. of ashutter mounted on said body, a setting mem er on said. shutter, meansfor supporting the camera including a pair of spaced handles one movablymounted with respect to the other and mechanism adapted to be moved bythe movable handle, and lost motion connection between the movablehandle and the shutter setting lever whereby the shutter setting levermay be moved by moving the handle in one direction and may remainstationary when the handle is moved in the other direc tion.

16. In an aviation camera, the combination with a camera body, of ashutter having setting and tripping levers thereon, mechan for trippingthe shutter including a spring means for tensioning the spring, saidmeans also being adapted to tension the shutter setting lever, andmechanism under the control of the operator for releasing the shuttertripping mechanism.

17. In an aviation camera, the combination with a camera body, of ashutter having setting and tripping levers thereon, mechanism fortripping the shutter including a spring, a. handle movably mounted onthe camera for tensioning the spring, a lever on the camera forreleasing the spring, and connections between said spring and saidshutter tor actuating the latter through the. tripping lever.

In an aviation camera, the combination with a camera body, of a shutterhaving setting and tripping levers thereon, mechanism for tripping theshutter including a spring, a handle movaily mounted on the camera tortensioning the spring, and the shutter setting lever. a tripping devicefor the spring, and connections between the spring and the shuttertrippin device whereby the shutter tripping lever may be moved throughthe s; sing.

19. in an aviation camera, the combination with a camera body, of ashutter having setting and tripping levers thereon, mechan' m fortripping the shutter including a spring, means for simultaneouslytensioning the spring the shutter setting lever, and means for releasingthe shutter through the spring.

20. In an aviation camera,

the combination vith a camera booy, of a shutter having set ting andtripping levers thereon, mechanism for tripping the shutter including aspring, a handle movably mounted on the camera body, connections betweenthe handle, spring and shutter setting levers for tensioning the springand shutter setting lever through movement of the handle.

Signed at Rochester, New York this 2nd day of July 1927.

GEORGE H. OHLAU.

